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Localization ruler used for RLPN-OS. The localization ruler mainly consists of two right-angle rulers with lengths of 20 and 25 cm, respectively. These two rulers are fixed together with a metal rivet, and a slide rail is left in the center of the rulers for the rivet to move. The graduation of the ruler can be adjusted by moving the position of the rivet based on the chest anatomical parameters obtained from preoperative CT scans.
